* {
    margin: 0;
    padding: 0;
    list-style: none;
}
.banner {
    height: 500px;
    background-color: #f2f2f2;
}
.banner .wrapper {
    width: 1240px;
    height: 500px;
    margin: 0 auto;
    position: relative;
}
.banner .wrapper ul .banner-item {
    display: none; /* 默认隐藏所有图片项 */
    width: 1240px;
    height: 500px;
    margin: 0 auto;
}

.banner .wrapper ul .banner-item.active {
    display: block; /* 显示当前活动的图片项 */
}


.banner .aside {
    position: absolute;
    top: 0;
    left: 0;
    width: 250px;
    height: 500px;
    background-color: rgba(0,0,0,0.8);
}
.banner .aside li {

    height: 50px;
    line-height: 50px;
}
.banner .aside a {
    position: relative;
    text-decoration: none;
    padding-left: 36px;
    padding-right: 19px;
    display: block;
    height: 50px;
    color: white;
}
.banner .aside a span{
    margin-left: 15px;
    font-size: 14px;
}
.banner .aside a:hover {
    background-color: mediumseagreen;
}
.banner .aside a::after {
    position: absolute;
    right: 20px;
    top: 20px;
    content: '';
    width: 6px;
    height: 11px;
    background-image: url('../src/banner/loge.png');
    background-position: -80px -110px;
}
.prev, .next {
    position: absolute;
    top:228px;
    width: 45px;
    height: 45px;
    background-color: rgba(0,0,0,0.2);
    background-image: url('../src/banner/loge.png');
    border-radius: 50%;
}
.next {
    left: 260px;
    background-position: 14px -60px;
}
.prev {
    right: 10px;
    background-position: -23px -60px;
}
.banner ol{
    position: absolute;
    left: 650px;
    bottom: 30px;
    height: 10px;
    width: 200px;
}
.banner ol li{
    float: left;
    width: 10px;
    height: 10px;
    background-color: rgba(255,255,255,0.4);
    border-radius: 50%;
    margin-right: 30px;
}
.banner ol .active{
    background-color: white;
}